Haier HB21FWRSS Service Manual page 31

After one defrosting cycle and the compressor and fan motor have stopped running more
than 7 minutes, if the freezer sensor temperature is over the stopping point, the compressor will
start running immediately. Then the cooling fan motor will start running after the compressor has
worked 5 minutes, the air escaper ON/OFF will control according to the temperature. If the
freezer sensor temperature is lower than stopping point, it will wait until the temperature come
back to the top of stopping point. Then the cooling fan motor will start running after the
compressor has worked 5 minutes, the air escaper ON/OFF will control according to the
temperature.
Advance Cooling before Defrosting：In order to assure the lowest temperature rise of the
freezer room and fridge room, the compressor and cooling fan motor will start running until the
freezer sensor temperature reach to the off-point -3 ºC, then start defrosting. If the product can't
reach off-point -3 ºC more than 30 minutes, the forced defrosting mode will start.
９